타입스크립트 함수 반환값 타입 예제

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function 함수이름(매개변수: 타입): 반환타입 {
  return 반환값;
}

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function add(a: number, b: number): number {
  return a + b;
}

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function multiply(a: number, b: number) {
  return a * b;
}

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function multiply(a: number, b: number): number {
  return a * b;
}

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function getPrice(): number {
  return 15000;
}

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function getUserName(): string {
  return "민수";
}

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function isLoggedIn(): boolean {
  return true;
}

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function getNumbers(): number[] {
  return [1, 2, 3];
}

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function getNames(): Array<string> {
  return ["철수", "영희", "민수"];
}

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function getUser(): { id: number; name: string } {
  return {
    id: 1,
    name: "지영",
  };
}

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type User = {
  id: number;
  name: string;
  email: string;
};


function getUser(): User {
  return {
    id: 1,
    name: "지영",
    email: "jiyoung@example.com",
  };
}

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function printMessage(message: string): void {
  console.log(message);
}

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async function getUserId(): Promise<number> {
  return 1;
}

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async function fetchUserName(): Promise<string> {
  return "민수";
}

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type User = {
  id: number;
  name: string;
};

async function fetchUser(): Promise<User> {
  return {
    id: 1,
    name: "수진",
  };
}

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function throwError(message: string): never {
  throw new Error(message);
}

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function identity<T>(value: T): T {
  return value;
}

const numberValue = identity(10);
const stringValue = identity("hello");

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